JP3146620U - Circularly polarized antenna with broadband coplanar waveguide feeding - Google Patents

Abstract

Provided is a circularly polarized antenna using a broadband coplanar waveguide feeding capable of transmitting and receiving a circularly polarized signal in a WiMAX working frequency range.
A circular coplanar waveguide feed capable of transmitting and receiving circularly polarized signals in one working frequency range (for example, 3.3 GHz to 3.8 GHz) in WiMAX (registered trademark) in particular. A polarization antenna is provided. The antenna includes a substrate having a surface, a signal transmission unit that is installed on the surface and includes a transmission unit, a matching unit, and an extension unit; a first ground unit that is installed on the surface and includes a first ground unit; And a second ground unit provided on the surface and including a second ground portion. The extending portion extends and protrudes from the alignment portion and is electrically connected to the alignment portion, and is disposed horizontally or vertically. The transmission unit is electrically connected to the matching unit and positioned between the first ground unit and the second ground unit.
[Selection] Figure 2

Description

  The present invention relates to a circularly polarized antenna with a broadband coplanar waveguide feed, which can be used as a “two-way radiation unit” without covering a metal conductor (ground plate), and It is also possible to use a “unidirectional radiation unit” by covering a metal conductor. In addition, with a suitable antenna design, the circularly polarized antenna with wideband coplanar waveguide feeding of the present invention can transmit and receive circularly polarized signals in one working frequency range (for example, 3.3GHz to 3.8GHz) in WiMAX. It is also possible to do.

  With the progress of wireless communication technology, the frequency range required for wireless communication is also updated. Among them, WiMAX technology using microwaves as the working frequency has been widely applied in the near future, but currently there are not many WiMAX antennas applied in the frequency range between 3.3 GHz and 3.8 GHz. Since a linearly polarized antenna is the main, it can only transmit and receive linearly polarized signals. The antenna disclosed in Patent Document 1 generates line polarization only in the vicinity of 3.5 GHz. However, an antenna that transmits and receives only a linearly polarized signal in the area of wireless communication cannot meet the demand, and this places great restrictions on the use of the wireless communication apparatus.

Taiwan Patent Gazette No. I262625 Specification

  In the known mixed monopole antenna shown in FIG. 1, the ground plane 12 is substantially rectangular in shape and includes an upper edge 121, and further includes a ground point 122 near the upper edge 121. The medium substrate 13 is located at the upper edge 121 of the ground surface 12 and extends in a direction away from the ground surface 12. The vertical radiating metal line 14 is positioned on the medium substrate 13 and includes a start end 141 and an end end 142. The start end 141 is positioned near the upper edge 121 of the ground plane 12 as an antenna feeding point, and the end end 142 is It is on an extension line in a direction away from the ground plane 12. The horizontal radiating mixing component 15 is located on the medium substrate 13 and is connected to the vertical radiating metal wire 14 substantially vertically. The horizontal radiating mixing component 15 includes a ceramic antenna 16 and a fine-tuning metal wire 163. One resonance frequency band is generated. The first horizontal radiating metal line 17 is located on the medium substrate 13 and is connected to the vertical radiating metal line 14 substantially vertically, and the first horizontal radiating metal line 17 generates a second resonance frequency band. Is. The second horizontal radiating metal line 18 is located on the medium substrate 13 and is connected to the vertical radiating metal line 14 substantially vertically, and the second horizontal radiating metal line generates a third resonance frequency band. is there. The feed transmission line 19 transmits a signal, and includes a central conductor 191 connected to the start end 141 of the vertical radiating metal line 14 and an outer layer ground conductor 192 connected to the ground point 122 of the ground plane 12.

  The first horizontal radiating metal line 17 includes a start end 171 and an end end 172, the start end 171 is electrically connected to the vertical radiating metal line 14, and the end end 172 is parallel to the horizontal radiating mixed component 15. It extends in a direction away from the open circuit end 151. Similarly, the second horizontal radiating metal line 18 also includes a start end 181 and an end end 182, the start end 181 is electrically connected to the vertical radiating metal line 14, and the end end 182 is a parallel horizontal radiating mixing component 15. It extends in the open circuit end 151 direction. In the present antenna, the vertical radiating metal line 14, the finely adjusted metal line 163 of the horizontal radiating mixed component, the first horizontal radiating metal line 17, and the second horizontal radiating metal line 18 are formed on the medium substrate 13 by printing or etching techniques. Is done. Further, the ceramic antenna 16 of the horizontal radiation mixing component includes a start end 161 and an end end 162, the start end 161 is electrically connected to the vertical radiation metal wire 14, and the end end 162 is electrically connected to the fine adjustment metal wire 163. Connect to.

  The arrangement of the above connection method effectively reduces the antenna size and the area occupied by it, and at the same time has a sufficient operating frequency width (ie, the 2.4 GHz band and the 5 GHz band required for current wireless area networks). Operational requirements and operation requirements for the 2.5 GHz, 3.5 GHz, and 5 GHz bands necessary for global microwave access to the network). However, this antenna can only transmit and receive linearly polarized signals.

  In view of the drawback that the antenna can only transmit and receive linearly polarized signals, the industry needs a circularly polarized antenna with a broadband coplanar waveguide feed capable of transmitting and receiving circularly polarized signals in the WiMAX working frequency range.

  An object of the present invention is to provide a circularly polarized antenna using a broadband coplanar waveguide feeding capable of transmitting and receiving a circularly polarized signal in one working frequency range (for example, 3.3 GHz to 3.8 GHz) in WiMAX. It is in.

In order to achieve the above-described object, a circularly polarized antenna using a broadband coplanar waveguide feeding according to the present invention includes a substrate having a surface, a signal transmission unit that is installed on the surface and includes a transmission unit, a matching unit, and an extension unit. The first ground unit provided on the surface and provided with a first ground part, and the second ground unit provided on the surface and provided with a second ground part. The extending portion extends and protrudes from the matching portion, and the matching portion is electrically connected to the transmission portion and the extending portion, and the transmission portion is positioned between the first ground portion and the second ground portion.
Therefore, by providing the designed signal transmission unit, the first ground unit, and the second ground unit, the broadband coplanar waveguide of the present invention is designed after the antenna design via the circularly polarized antenna by the broadband coplanar waveguide feeding of the present invention. A circularly polarized antenna with a waveguide feed can transmit and receive a circularly polarized signal in one working frequency range (for example, 3.3 GHz to 3.8 GHz) in WiMAX.
In addition, the circularly polarized antenna using the broadband coplanar waveguide feeding according to the present invention further includes an annular portion provided with a signal transmission unit, a first ground unit, and a second ground unit inside, the annular portion being As a good example, a rectangular annular body having one opening, a square annular body having one opening, or a polygonal annular body having one opening can be given as a preferable one. The extending portion of the circularly polarized antenna by the broadband coplanar waveguide feeding of the present invention extends vertically or horizontally on the surface of the substrate, and the best example of the shape is rectangular or square. The circularly polarized antenna using the broadband coplanar waveguide feeding of the present invention may be any substrate, but the FR-4 material microwave substrate, the duroid material microwave substrate, Teflon (Teflon) ) Material microwave substrate, Rohacell material microwave substrate, gallium arsenide (GaAs) material microwave substrate, ceramic material microwave substrate, silicon substrate are good. The material of the signal transmission unit, the first ground unit, and the second ground unit in the circularly polarized antenna fed by the broadband coplanar waveguide of the present invention may be any type of metal, but copper, aluminum, and gold are good. . The material of the ground plate of the circularly polarized antenna by the broadband coplanar waveguide feeding of the present invention may be any kind of metal, but copper, aluminum and gold are preferable. The circularly polarized antenna using the broadband coplanar waveguide feeding of the present invention can transmit and receive high frequency signals in the frequency range, and the frequency range is good between 3.3 GHz and 3.8 GHz.

  The circularly polarized antenna using the broadband coplanar waveguide feeding of the present invention can be used as a “two-way radiation unit” without covering the metal conductor (ground plate). It can also be used as a “unidirectional radiation unit”, and after passing through an appropriate antenna design, the circularly polarized antenna with the wideband coplanar waveguide feeding of the present invention is one of the tasks of WiMAX. A circularly polarized signal can be transmitted and received in a frequency range (for example, 3.3 GHz to 3.8 GHz).

  As shown in FIG. 2, the circularly polarized antenna using the broadband coplanar waveguide feeding according to the first embodiment of the present invention includes a substrate 21, a signal transmission unit 22, a first ground unit 23, and a second ground unit 24. . The substrate 21 has a surface 211, and the signal transmission unit 22, the first ground unit 23, and the second ground unit 24 are respectively installed on the surface 211. In the first embodiment of the present invention, the substrate 21 is a microwave substrate of FR-4 material, the medium constant is 4.4, and the thickness is 1.6 mm. However, in different application situations, the substrate 21 is made of a Duroid material microwave substrate, a Teflon material microwave substrate, a Rohacell material microwave substrate, a gallium arsenide (GaAs) material. A microwave substrate, a ceramic material microwave substrate, or a silicon substrate may be used.

  The signal transmission unit 22 includes a transmission unit 221, a matching unit 222, and an extending unit 223, and the extending unit 223 extends and protrudes from the matching unit 222. The matching unit 222 is electrically connected to the transmission unit 221 and the extending unit 223, and the transmission unit 221 is further electrically connected to a signal processing unit (not shown). The extending portion 223 extends horizontally with respect to the surface 211 of the substrate 21. In the first embodiment of the present invention, the shape of the extending portion 223 is a rectangle, but it can be a different shape such as a polygon or a square in different application situations.

  In FIG. 2, the first ground unit 23 includes a first ground portion 231, a first ground extending portion 232 is further extended to one end of the first ground portion 231, and the first ground extending portion 232 is extended. It is located near the portion 223 and installed on the surface 211. The second ground unit 24 includes a second ground portion 241, a second ground extending portion 242 is further extended at one end of the second ground portion 241, and the second ground extending portion 242 and the first ground extending portion are extended. The shape of 232 is the same. In the circularly polarized antenna with the broadband coplanar waveguide feeding according to the first embodiment of the present invention, the transmission unit 221 is located between the first ground unit 231 and the second ground unit 241, that is, “coplanar feeding”. Form a structure. In addition, the matching unit 222 and the extending unit 223 are located between the first ground extending unit 232 and the second ground extending unit 242, that is, the signal transmission unit 22 includes the first ground unit 23 and the second ground unit 24. It is the structure inserted | pinched between. It should be noted that the material of the signal transmission unit 22, the first ground unit 23, and the second ground unit 24 in the first embodiment of the present invention is copper, but in different application situations, the signal transmission unit 22, The material of the first ground unit 23 and the second ground unit 24 may be aluminum or gold.

  Finally, the circularly polarized antenna using the broadband coplanar waveguide feeding according to the first embodiment of the present invention further includes an annular portion 25, which includes the signal transmission unit 22, the first ground unit 23, and the second portion. Installed with the ground unit 24 inside. The annular portion 25 in the first embodiment of the present invention is a rectangular annular body having one opening. However, in different application situations, the annular portion 25 has a square annular body having one opening or one opening. It can also be a polygonal annular body.

  FIG. 3 is a plan view of a circularly polarized antenna with a broadband coplanar waveguide feeding in the first embodiment of the present invention. The numerical values of the respective display symbols shown in the circularly polarized antenna with the broadband coplanar waveguide feeding in the first embodiment of the present invention in FIG.

  FIG. 4 is a graph showing the relationship between the return loss of the circularly polarized antenna by the broadband coplanar waveguide feeding in the first embodiment of the present invention and the antenna working frequency. Curve I in the figure is a curve obtained by simulating with IE3D simulation software, and curve J is obtained by actually measuring a circularly polarized antenna with a broadband coplanar waveguide feeding in the first embodiment of the present invention. It is the obtained curve. From FIG. 4, it can be seen that the circularly polarized antenna with the wideband coplanar waveguide fed according to the first embodiment of the present invention has a return loss of −10 db or less in a frequency range of approximately 2.8 GHz to 4 GHz. That is, the frequency width of the return loss 10db in the circularly polarized antenna fed by the broadband coplanar waveguide of the first embodiment of the present invention is about 1.2 GHz.

  FIG. 5 is a graph showing the relationship between the axial ratio in the main beam direction and the antenna working frequency in the circularly polarized antenna with the broadband coplanar waveguide feeding according to the first embodiment of the present invention. The curve K in the figure is a curve obtained by simulating with IE3D simulation software, and the curve L is obtained by actually measuring the circularly polarized antenna with the broadband coplanar waveguide feeding in the first embodiment of the present invention. It is the obtained curve. From FIG. 5, in the circularly polarized antenna with the broadband coplanar waveguide fed according to the first embodiment of the present invention, the axial ratio in the main beam direction within the frequency range between 3.3 GHz and 4.1 GHz is approximately 3 db or less. I understand. That is, the frequency width of the axial ratio 3db in the circularly polarized antenna fed by the broadband coplanar waveguide of the first embodiment of the present invention is about 0.8 GHz.

  FIG. 6 is a graph showing the relationship between the gain on the main beam direction and the antenna working frequency in the circularly polarized antenna fed by the broadband coplanar waveguide of the first embodiment of the present invention. The curve M in the figure is a curve obtained by simulating with IE3D simulation software, and the curve N is obtained by actually measuring the circularly polarized antenna with the broadband coplanar waveguide feeding in the first embodiment of the present invention. It is the obtained curve. From FIG. 6, it can be seen that the gain of the circularly polarized antenna using the broadband coplanar waveguide feeding of the first embodiment of the present invention is approximately 3 dB or more in a frequency range of approximately 3 GHz to 4.4 GHz.

  Accordingly, from FIGS. 4, 5, and 6, the circularly polarized antenna with the wideband coplanar waveguide feeding according to the first embodiment of the present invention has one working frequency range (for example, 3.3 GHz) in WiMAX. It was actually revealed that circularly polarized signals are transmitted and received at 3.8 GHz).

  As shown in FIG. 7, the circularly polarized antenna using the broadband coplanar waveguide feeding in the second embodiment of the present invention includes a substrate 51, a signal transmission unit 52, a first ground unit 53, and a second ground unit 54. . The substrate 51 has a surface 511, and the signal transmission unit 52, the first ground unit 53, and the second ground unit 54 are respectively installed on the surface 511. In the second embodiment of the present invention, the substrate 51 is a microwave substrate of FR-4 material, the medium constant is 4.4, and the thickness is 1.6 mm. However, in different application situations, the substrate 51 may be made of a Duroid material microwave substrate, a Teflon material microwave substrate, a Rohacell material microwave substrate, a gallium arsenide (GaAs) material. A microwave substrate, a ceramic material microwave substrate, or a silicon substrate may be used.

  The signal transmission unit 52 includes a transmission unit 521, a matching unit 522, and an extending unit 523, and the extending unit 523 extends and protrudes from the matching unit 522. The matching unit 522 is electrically connected to the transmission unit 521 and the extending unit 523, and the transmission unit 521 is further electrically connected to a signal processing unit (not shown). The extending portion 523 extends vertically on the surface 511 of the substrate 51. In the second embodiment of the present invention, the shape of the extending portion 523 is a rectangle, but it may be a different shape such as a polygon or a square in different application situations.

  In FIG. 7, the first ground unit 53 includes a first ground portion 531, a first ground extending portion 532 is further extended to one end of the first ground portion 531, and the first ground extending portion 532 is extended. Installed on the surface 511 away from the portion 523. The second ground unit 54 includes a second ground portion 541, a second ground extending portion 542 is further extended to one end of the second ground portion 541, and the second ground extending portion 542 and the first ground extending portion are extended. The shape of 532 is the same. In the circularly polarized antenna using the broadband coplanar waveguide feeding according to the second embodiment of the present invention, the transmission unit 521 is located between the first grounding portion 531 and the second grounding portion 541, that is, “coplanar feeding”. Form a structure. In addition, the matching portion 522 and the extending portion 523 are located between the first ground extending portion 532 and the second earth extending portion 542, that is, the signal transmission unit 52 includes the first earth unit 53 and the second earth unit 54. It is the structure inserted | pinched between. It should be noted that the material of the signal transmission unit 52, the first ground unit 53, and the second ground unit 54 in the second embodiment of the present invention is copper, but in different application situations, the signal transmission unit 52, The material of the first ground unit 53 and the second ground unit 54 may be aluminum or gold.

  Finally, the circularly polarized antenna using the broadband coplanar waveguide feeding according to the second embodiment of the present invention further includes an annular portion 55, which includes the signal transmission unit 52, the first ground unit 53, and the second portion. The grounding unit 54 is set inside and installed on them. In the second embodiment of the present invention, the annular portion 55 is a rectangular annular body having one opening. However, in different application situations, the annular portion 55 has a square annular body having one opening or one opening. It can also be a polygonal annular body.

  As described above, by providing the designed signal transmission unit, the first ground unit, and the second ground unit, the antenna design by the circularly polarized antenna by the broadband coplanar waveguide feeding of the present invention is followed by the broadband coplanar of the present invention. A circularly polarized antenna using a waveguide feed can transmit and receive a circularly polarized signal in one working frequency range (for example, 3.3 GHz to 3.8 GHz) in WiMAX.

It is a three-dimensional view of a known broadband antenna. FIG. 3 is a three-dimensional view of a circularly polarized antenna with a broadband coplanar waveguide feeding in the first embodiment of the present invention. It is a top view of the circularly polarized wave antenna by the broadband coplanar waveguide feeding in 1st Example of this invention. 6 is a graph showing a relationship between a return loss of a circularly polarized antenna and a working frequency of an antenna by a broadband coplanar waveguide feeding in the first embodiment of the present invention. 6 is a graph showing the relationship between the axial ratio in the main beam direction and the antenna working frequency in a circularly polarized antenna fed by a broadband coplanar waveguide of the first embodiment of the present invention. 6 is a graph showing a relationship between a gain in the main beam direction and an antenna working frequency in a circularly polarized antenna fed by a broadband coplanar waveguide of the first embodiment of the present invention. It is a three-dimensional view of a circularly polarized antenna with a wideband coplanar waveguide feeding in a second embodiment of the present invention.

Explanation of symbols

12 Ground surface 121 Upper edge 122 Ground point 13 Media substrate 14 Vertical radiation metal wire 141 Start end 142 End end 15 Horizontal radiation mixing component 151 Open circuit end 16 Ceramic antenna 161 Start end 162 End end 163 Fine adjustment metal wire 17 First horizontal Radiation metal wire 171 Start end 172 End end 18 Second horizontal radiation metal wire 181 Start end 182 End end 19 Feeding transmission line 191 Center conductor 192 Outer ground conductor 21 Substrate 211 Surface 22 Signal transmission unit 221 Transmission unit 222 Matching unit 223 Extending unit 23 1st earthing unit 231 1st earthing part 232 1st earthing extension part 24 2nd earthing unit 241 2nd earthing part 242 2nd earthing extension part 25 annular part 26 earthing board 51 board 511 surface 52 signal transmission unit 522 matching part 523 Stretching 53 The first ground unit 531 first ground unit 532 first ground extending portion 54 the second ground unit 541 second ground unit 542 second ground extending portion 55 the annular portion 56 the earth plate

Claims (10)

A substrate with a surface;
A signal transmission unit installed on the surface and including a transmission unit, a matching unit, and an extension unit;
A first grounding unit installed on the surface and provided with a first grounding part;
A second ground unit provided on the surface and provided with a second ground portion;
The extension part extends and protrudes from a matching part, the matching part is electrically connected to the transmission part and the extension part, and the transmission part is located between the first ground part and the second ground part. Circularly polarized antenna with coplanar waveguide feeding.   2. The circularly polarized antenna with a broadband coplanar waveguide feed according to claim 1, wherein the circularly polarized antenna with a broadband coplanar waveguide feed further comprises a ground plate, the ground plate and the substrate being a signal transmission unit, A circularly polarized antenna using a broadband coplanar waveguide feeding, characterized by sandwiching one ground unit and a second ground unit.   3. The circularly polarized antenna with a broadband coplanar waveguide feed according to claim 2, wherein the circularly polarized antenna with a broadband coplanar waveguide feed further comprises an annular portion, the annular portion is installed on the surface, and a signal A circularly polarized antenna using a broadband coplanar waveguide feeding, wherein a transmission unit, a first ground unit, and a second ground unit are installed inside.   4. The circularly polarized wave antenna with a broadband coplanar waveguide feed according to claim 3, wherein the annular portion is a rectangular annular body having one opening.   4. A circularly polarized wave antenna with a broadband coplanar waveguide feed according to claim 3, wherein the extending portion extends horizontally on the surface of the substrate.   4. The circularly polarized antenna according to claim 3, wherein the extending portion extends perpendicularly on the surface of the substrate.   6. The circularly polarized wave antenna with a broadband coplanar waveguide feed according to claim 5, wherein the extending portion has a rectangular shape.   7. The circularly polarized wave antenna with a broadband coplanar waveguide feed according to claim 6, wherein the extending portion has a rectangular shape.   4. The circularly polarized antenna with a broadband coplanar waveguide feed according to claim 3, wherein a first ground extending portion is further extended to one end of the first ground portion, and a second ground extending portion is further extended to one end of the second ground portion. And a circularly polarized antenna using a broadband coplanar waveguide feeding, wherein the first ground extending portion and the second ground extending portion have the same shape.   4. A wideband coplanar waveguide-fed circularly polarized antenna according to claim 3, wherein a high frequency signal is transmitted and received in one working frequency range, and the working frequency range is 3.3 GHz to 3.8 GHz. Circularly polarized antenna with waveguide feed.

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